190 ©. R. Osten Sacken: 
looks like a branch of the second vein. This structure probably 
serves to strengthen the interval between the second vein and the 
margin, unusually broad here. A similar supernumerary crossvein 
oceurs in some Trypetae, like T. gibba Loew and a brazilian Zry- 
peta, wrongly taken for an Ortalid by Mr. Bigot!). 
The contact of the submarginal cell with the discal is not a 
necessary generic character, although it occurs in the typical species, 
as well as in the two species described by me since (P. praeusta 
0. S. Biol. Centr. Am. Dipt. p. 8 and P. collaris described below). 
For this reason I consider the Limnobia fasctolaris Wied. A. Z. 
I, p. 552, Tab. 6b, f. 11 (Brazil) as a Paratropesa, although it is 
figured with an open discal cell. Schiner suspected this relation- 
ship (l. e.), but overlooked the difference in the structure of the first 
posterior cell. I find in my notes that I saw the type in Frankfort. 
The four species at present known belong to tropical America. 
Paratropesa collaris n.sp. ö. Black, with metallic blue 
and purple lustre; collare yellow; abdomen with the hind margins 
of the segments yellow; wings with crossband and apex brown. Long. 
corp. 6—7 mm. 
Upper part of the head metallic, purple; the elongate rostrum 
and front between the eyes yellow; palpi and antennae brownish; 
the latter pale yellow at base. Collare elongate yellow: thorax black, 
shining, with purple metallic reflections; these are bluish behind the 
suture; halteres with a yellow knob, stem brownish. Abdomen black, 
with metallic purplish reflections, hind margins of the segments pale 
yellow. Front legs black, except the coxae and the extreme base 
of the femora, which are yellow; femora incrassate and very hairy 
on the distal half; middle femora yellow, not incrassate; tibiae and 
tarsi dark brown; hind femora infuscate at base and tip, so that a 
broad pale ring is left in the middle, incrassate and hairy towards 
the tip; tibiae and tarsi blackish, with dense, dark pile. — Wings 
hyaline; a brown cloud at the root of the basal cells, reaching the 
costa; a pale brownish crossband runs from the darker brown stigma 
to the hind margin; apex of the wing brown, which color is limited 
posteriorly by the short branch of the second vein and by the ceross- 
vein at the base of the second posterior cell. The discal and sub- 
marginal cells are in contact, as in the typical P, singularis. 
Hab. Upper Amazon River (British Museum, coll. Bates; also 
in the collection of M. v. Roeder in Hoym). 
1) Mikimyia furcifera Bigot, Bullet. Soc. Ent. Fr. 13. fövr. 1884. 
